# TPData

## C Specification

      #include <nitro/spi.h>

      typedef struct {
              u16     x;
              u16     y;
              u16     touch;
              u16     validity;
      } TPData;

## Description

This structure expresses touch panel coordinates.
You can use this structure for raw touch panel values as well as for screen coordinate values.

`touch` acquires the following values, and shows whether the touch panel is currently being touched.

    TP_TOUCH_OFF      0      //  Touch panel is not being touched
    TP_TOUCH_ON       1      //  Touch panel is being touched

`validity` acquires the following values and shows the validity of the results that were obtained from the chattering measure process.

Even when this flag is INVALID, touch value is valid. Therefore, you should still perform ON/OFF assessment.

    TP_VALIDITY_VALID         0        // Valid data
    TP_VALIDITY_INVALID_X     1        // X coordinate data is invalid
    TP_VALIDITY_INVALID_Y     2        // Y coordinate data is invalid
    TP_VALIDITY_INVALID_XY   (TP_VALIDITY_INVALID_X | TP_VALIDITY_INVALID_Y)   // X, Y coordinate data are both invalid

## Arguments

`x` | x coordinate
`y` | y coordinate
`touch` | Touch determination flag
`validity` | Coordinate value validity flag Even when INVALID, touch value is valid

## Revision History

04/16/2004 Initial version